kernel/drivers/regulator/arizona-ldo1.c

   1 /*
   2  * arizona-ldo1.c  --  LDO1 supply for Arizona devices
   3  *
   4  * Copyright 2012 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/bitops.h>
  18 #include <linux/err.h>
  19 #include <linux/of.h>
  20 #include <linux/of_gpio.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/regulator/driver.h>
  23 #include <linux/regulator/machine.h>
  24 #include <linux/regulator/of_regulator.h>
  25 #include <linux/gpio.h>
  26 #include <linux/slab.h>
  27
  28 #include <linux/mfd/arizona/core.h>
  29 #include <linux/mfd/arizona/pdata.h>
  30 #include <linux/mfd/arizona/registers.h>
  31
  32 struct arizona_ldo1 {
  33         struct regulator_dev *regulator;
  34         struct arizona *arizona;
  35
  36         struct regulator_consumer_supply supply;
  37         struct regulator_init_data init_data;
  38 };
  39
  40 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
  41                                         unsigned int selector)
  42 {
  43         if (selector >= rdev->desc->n_voltages)
  44                 return -EINVAL;
  45
  46         if (selector == rdev->desc->n_voltages - 1)
  47                 return 1800000;
  48         else
  49                 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
  50 }
  51
  52 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
  53                                        int min_uV, int max_uV)
  54 {
  55         int sel;
  56
  57         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
  58         if (sel >= rdev->desc->n_voltages)
  59                 sel = rdev->desc->n_voltages - 1;
  60
  61         return sel;
  62 }
  63
  64 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
  65                                            unsigned sel)
  66 {
  67         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  68         struct regmap *regmap = ldo->arizona->regmap;
  69         unsigned int val;
  70         int ret;
  71
  72         if (sel == rdev->desc->n_voltages - 1)
  73                 val = ARIZONA_LDO1_HI_PWR;
  74         else
  75                 val = 0;
  76
  77         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
  78                                  ARIZONA_LDO1_HI_PWR, val);
  79         if (ret != 0)
  80                 return ret;
  81
  82         if (val)
  83                 return 0;
  84
  85         val = sel << ARIZONA_LDO1_VSEL_SHIFT;
  86
  87         return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
  88                                   ARIZONA_LDO1_VSEL_MASK, val);
  89 }
  90
  91 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
  92 {
  93         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  94         struct regmap *regmap = ldo->arizona->regmap;
  95         unsigned int val;
  96         int ret;
  97
  98         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
  99         if (ret != 0)
 100                 return ret;
 101
 102         if (val & ARIZONA_LDO1_HI_PWR)
 103                 return rdev->desc->n_voltages - 1;
 104
 105         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
 106         if (ret != 0)
 107                 return ret;
 108
 109         return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
 110 }
 111
 112 static struct regulator_ops arizona_ldo1_hc_ops = {
 113         .list_voltage = arizona_ldo1_hc_list_voltage,
 114         .map_voltage = arizona_ldo1_hc_map_voltage,
 115         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
 116         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
 117         .get_bypass = regulator_get_bypass_regmap,
 118         .set_bypass = regulator_set_bypass_regmap,
 119 };
 120
 121 static const struct regulator_desc arizona_ldo1_hc = {
 122         .name = "LDO1",
 123         .supply_name = "LDOVDD",
 124         .type = REGULATOR_VOLTAGE,
 125         .ops = &arizona_ldo1_hc_ops,
 126
 127         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
 128         .bypass_mask = ARIZONA_LDO1_BYPASS,
 129         .min_uV = 900000,
 130         .uV_step = 50000,
 131         .n_voltages = 8,
 132         .enable_time = 1500,
 133
 134         .owner = THIS_MODULE,
 135 };
 136
 137 static struct regulator_ops arizona_ldo1_ops = {
 138         .list_voltage = regulator_list_voltage_linear,
 139         .map_voltage = regulator_map_voltage_linear,
 140         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 141         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 142 };
 143
 144 static const struct regulator_desc arizona_ldo1 = {
 145         .name = "LDO1",
 146         .supply_name = "LDOVDD",
 147         .type = REGULATOR_VOLTAGE,
 148         .ops = &arizona_ldo1_ops,
 149
 150         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
 151         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
 152         .min_uV = 900000,
 153         .uV_step = 25000,
 154         .n_voltages = 13,
 155         .enable_time = 500,
 156
 157         .owner = THIS_MODULE,
 158 };
 159
 160 static const struct regulator_init_data arizona_ldo1_dvfs = {
 161         .constraints = {
 162                 .min_uV = 1200000,
 163                 .max_uV = 1800000,
 164                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 165                                   REGULATOR_CHANGE_VOLTAGE,
 166         },
 167         .num_consumer_supplies = 1,
 168 };
 169
 170 static const struct regulator_init_data arizona_ldo1_default = {
 171         .constraints = {
 172                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 173         },
 174         .num_consumer_supplies = 1,
 175 };
 176
 177 static const struct regulator_init_data arizona_ldo1_wm5110 = {
 178         .constraints = {
 179                 .min_uV = 1175000,
 180                 .max_uV = 1200000,
 181                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 182                                   REGULATOR_CHANGE_VOLTAGE,
 183         },
 184         .num_consumer_supplies = 1,
 185 };
 186
 187 static int arizona_ldo1_of_get_pdata(struct arizona *arizona,
 188                                      struct regulator_config *config,
 189                                      const struct regulator_desc *desc)
 190 {
 191         struct arizona_pdata *pdata = &arizona->pdata;
 192         struct arizona_ldo1 *ldo1 = config->driver_data;
 193         struct device_node *np = arizona->dev->of_node;
 194         struct device_node *init_node, *dcvdd_node;
 195         struct regulator_init_data *init_data;
 196
 197         pdata->ldoena = of_get_named_gpio(np, "wlf,ldoena", 0);
 198         if (pdata->ldoena < 0) {
 199                 dev_warn(arizona->dev,
 200                          "LDOENA GPIO property missing/malformed: %d\n",
 201                          pdata->ldoena);
 202                 pdata->ldoena = 0;
 203         } else {
 204                 config->ena_gpio_initialized = true;
 205         }
 206
 207         init_node = of_get_child_by_name(np, "ldo1");
 208         dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
 209
 210         if (init_node) {
 211                 config->of_node = init_node;
 212
 213                 init_data = of_get_regulator_init_data(arizona->dev, init_node,
 214                                                        desc);
 215
 216                 if (init_data) {
 217                         init_data->consumer_supplies = &ldo1->supply;
 218                         init_data->num_consumer_supplies = 1;
 219
 220                         if (dcvdd_node && dcvdd_node != init_node)
 221                                 arizona->external_dcvdd = true;
 222
 223                         pdata->ldo1 = init_data;
 224                 }
 225         } else if (dcvdd_node) {
 226                 arizona->external_dcvdd = true;
 227         }
 228
 229         of_node_put(dcvdd_node);
 230
 231         return 0;
 232 }
 233
 234 static int arizona_ldo1_probe(struct platform_device *pdev)
 235 {
 236         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 237         const struct regulator_desc *desc;
 238         struct regulator_config config = { };
 239         struct arizona_ldo1 *ldo1;
 240         int ret;
 241
 242         arizona->external_dcvdd = false;
 243
 244         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
 245         if (!ldo1)
 246                 return -ENOMEM;
 247
 248         ldo1->arizona = arizona;
 249
 250         /*
 251          * Since the chip usually supplies itself we provide some
 252          * default init_data for it.  This will be overridden with
 253          * platform data if provided.
 254          */
 255         switch (arizona->type) {
 256         case WM5102:
 257         case WM8997:
 258         case WM8998:
 259         case WM1814:
 260                 desc = &arizona_ldo1_hc;
 261                 ldo1->init_data = arizona_ldo1_dvfs;
 262                 break;
 263         case WM5110:
 264         case WM8280:
 265                 desc = &arizona_ldo1;
 266                 ldo1->init_data = arizona_ldo1_wm5110;
 267                 break;
 268         default:
 269                 desc = &arizona_ldo1;
 270                 ldo1->init_data = arizona_ldo1_default;
 271                 break;
 272         }
 273
 274         ldo1->init_data.consumer_supplies = &ldo1->supply;
 275         ldo1->supply.supply = "DCVDD";
 276         ldo1->supply.dev_name = dev_name(arizona->dev);
 277
 278         config.dev = arizona->dev;
 279         config.driver_data = ldo1;
 280         config.regmap = arizona->regmap;
 281
 282         if (IS_ENABLED(CONFIG_OF)) {
 283                 if (!dev_get_platdata(arizona->dev)) {
 284                         ret = arizona_ldo1_of_get_pdata(arizona, &config, desc);
 285                         if (ret < 0)
 286                                 return ret;
 287                 }
 288         }
 289
 290         config.ena_gpio = arizona->pdata.ldoena;
 291
 292         if (arizona->pdata.ldo1)
 293                 config.init_data = arizona->pdata.ldo1;
 294         else
 295                 config.init_data = &ldo1->init_data;
 296
 297         /*
 298          * LDO1 can only be used to supply DCVDD so if it has no
 299          * consumers then DCVDD is supplied externally.
 300          */
 301         if (config.init_data->num_consumer_supplies == 0)
 302                 arizona->external_dcvdd = true;
 303
 304         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
 305
 306         of_node_put(config.of_node);
 307
 308         if (IS_ERR(ldo1->regulator)) {
 309                 ret = PTR_ERR(ldo1->regulator);
 310                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
 311                         ret);
 312                 return ret;
 313         }
 314
 315         platform_set_drvdata(pdev, ldo1);
 316
 317         return 0;
 318 }
 319
 320 static struct platform_driver arizona_ldo1_driver = {
 321         .probe = arizona_ldo1_probe,
 322         .driver         = {
 323                 .name   = "arizona-ldo1",
 324         },
 325 };
 326
 327 module_platform_driver(arizona_ldo1_driver);
 328
 329 /* Module information */
 330 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 331 MODULE_DESCRIPTION("Arizona LDO1 driver");
 332 MODULE_LICENSE("GPL");
 333 MODULE_ALIAS("platform:arizona-ldo1");